Originally Posted by
carleton
I'm sorry to hear about this. I hope you get well soon.
1) What kind of bike?
2) Fixed or single speed?
3) If you felt occasional slippage, why did you not investigate?
It sounds like you dropped your chain either due to a really loose chain or perhaps flexing the rear of the bike which can severely move the chainline. The latter is possible if you are a big or strong rider and the bike isn't very stiff.
It's a 2010 Marin Inverness single speed. Slight slippage only happened once or twice and I thought it was more a case of brand new part 'finding its feet'. How wrong I seem to have been. Perhaps the chain was more slack after this part was fitted? - though assuming the same number of links and part sizes I don't know why that'd be the case.
I weigh in at about 95kgs. I cycle fast, so there's a lot of force going down - especially when out of saddle. I was probably hitting 25mph+ downhill when I went over.
So when I take my bike to a new mechanic and explain what's happened should I get the chain extra taught to counter my weight or will that only cause its own issues?